'u' that is the date letter as oppsed to the 'n' in the first pic
Hi Tel,
Sorry, I wasn't very clear as to what was what. The grouping of marks that includes the "U" mark are the English marks, they are, from left:
BFM - sponsor' mark
"U" - London import mark
925 - sterling standard
? - Date letter, it is just to the right of the 925, very faint and hard to see, but it is there.
The first image that includes the "N" mark shows the German marks with a repeat of Muller's "BHM" sponsor's mark to their left:
N - the Neresheimer maker's mark.
The two following marks are pseudomarks of the type commonly used on Hanau silver.
Hope this is clearer,
Tom
.